The party pig is a self-contained 8.5 liter (2.25 gallon) reusable beer package/dispenser that keeps beer fresh and carbonated. The Tap-A-Draft is a similar system that will hold an entire 5 gallon batch. The Tap-A-Draft uses 8 gram C02 cartridges to push the beer while the Party Pig uses a pressure pouch. They are both easy to store and fit into standard refrigerators.